EASA EAD 2014-0076-E AS350 AS355
Fuselage – Rear Structure Junction Frame Reinforcement Angles – Inspection
Applies to AS 350 B, BA, BB, B1, B2, B3 and D helicopters, and AS 355 E, F, F1, F2, N and NP helicopters, all serial numbers,
- if incorporating modification (MOD) 07 3215, or
- if equipped with at least one reinforcement angle, Part Number (P/N)
350A08.2493.21 or P/N 350A08.2493.23, following the repair carried out in accordance with MRM Work Card 53.10.22.772 or AMM Task 53-31-00, 8-5.
Reason: During the inspection of several AS 355 helicopters, cracks were found in the reinforcement angles of the rear structure / tail boom junction frame. Subsequent investigation revealed that cracks were initiated on the non-visible surface of the angle (surface in contact with the frame).
This condition, if not detected and corrected, could lead to further crack propagation and subsequent loss of the tail boom, resulting in loss of the helicopter.
For the reason described above, this AD requires repetitive inspections of the affected area and, depending on findings, replacement of affected parts.
Terminating corrective action is currently under investigation by Airbus Helicopters. This AD is considered as a temporary measure and further AD action may follow.